package servlet;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.User;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: ASUS
 * Date: 2024-01-16
 * Time: 17:32
 */
@WebServlet("/userInfo")
public class UserInfoServlet extends HttpServlet {
    private ObjectMapper objectMapper = new ObjectMapper();
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //从会话中拿到用户的信息返回即可
        HttpSession session = req.getSession(false);
        if(session == null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前用户未登录");
            return;
        }
        User user = (User) session.getAttribute("user");
        if(user == null){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("当前用户未登录");
            return;
        }
        //此时把 user对象转成json，并返回给浏览器
        resp.setContentType("application/json; charset=utf8");
        //需要注意的是，user中还有password属性，将密码返回不合适
        user.setPassword("");
        String respJson = objectMapper.writeValueAsString(user);
        resp.getWriter().write(respJson);
    }
}
